I bought the codes through GMG a few weeks ago along with UVHM2 and the Mechromancer. The latter two loaded up just fine, since I can select Mechromancer from characters available and Digistruct Peak is on the Fast Travel station...

None of the other locations from the Season Pass DLC are there even though they show up as purchased AND installed inside the game. What gives?

I ran into the same probs after downloading all Sp content. When I try to start one of the new "jobs" I'm forwarded to the Steam shop-site to buy the appropriate dlc. If I scroll down this window a bit I am told that I already bought this content (of course I did ...) Weird!

When I take a look on the games' overview I see that the status of every dlc is "bought" and "downloaded" (except "Premiere Club" whis is "bought" but marked as "not yet downloaded" -for what reason ever).

Here is what I have:Borderlands 2: "Content for download" ("Inhalte zum Herunterladen" aa I have a German language game version):